I don't have to worry about outing myself at work since I am the boss. Nevertheless, I don't bring up the issue of religion at work nor do I expect anyone else to do so, either. Back when I was an employee I didn't out myself then as I knew religion had no reason to be in the workplace. I had one boss who was quite religious -- attended church every Sunday, was a member of the FCA, his son is a preacher, etc. He would make comments here and there about church, especially on Monday morning when he asked everyone what they did over the weekend. I would always reply that I mowed the lawn, just like usual. A harmless question and an accurate response -- let's everyone know the deal.
Currently, I have clients who are pastors and who bring up religion during appointments, such as "May the good lord above keep us safe!" to which I simply reply "Indeed." It's their belief, not mine. When I have been asked "So, do you and your daughter attend church?", I respond with "No, I do not attend church. Sometimes my daughter attends church with her mother or with her friends -- she likes to see what different religions offer." I get curious, slightly disapproving facial expressions in response to that.
Once, in discussing the need for life insurance with a client who definitely had a need and the resources to pay for it, she replied, "Well, we believe in God and that he will tell us to do the right thing and take care of us in our moment of need" to which I replied "Maybe that's why He led you here today, to take care of you in a moment of need." She pushed away from the table a bit and said "I will discuss this with my husband." Yeah, I bet she didn't. I won't accept "the good lord taking care of us" as a response to anything serious in my line of work because if they thought the good lord was actually going to take care of them, they wouldn't be doing business with me in the first place.